Question: Who is {brother or sister} of {L. Brent Bozell, Jr.} {wife}  ?
Paraphrase: What is the name of L. Brent Bozell Jr.'s wife's sibling?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q6456366 wdt:P26 ?X . ?X wdt:P3373 ?answer}
Answer: William F. Buckley, Jr., James L. Buckley, Priscilla Buckley, Reid Buckley